Henry disston



@Snitch tatcs @anni @fitta IMPROVEMENT IN BUCK-SAW FRAMES.

dige flgrtnle mmh to inV tlgrsc Enters utmt mit mating glitt nf tige sume.

TO ALL WHOM I'I MAY CONCERN:

Bc it known that I, HENRY DISSTON, of Philadelphia, Pennsylvania, have invented an Improvement in. Saws; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

My invention relates to that class of saws in which the blade is secured to two arms, one of which is adjustable so as to regulate the tension on the blade, and is secured in its position by means of a rack catching en a pin; and my improvement consists of a guard covering the said rack, as described hereafter, whereby the operator is enabled to adjust and release the saw-frame without that wounding of the hands which frequently resulted in handling the saw as heretofore constructed. l

VIn order to enable others skilled in the art to make and use my inventionlI will now proceed to describe its construction and operation, reference being had to the accompanying drawing, which forms a part of this specification, and in which V Figure I is a side view, partly in section, of a saw with my improvement; and

Figures 2, 3, and 4, detached views of part of the saw. i l

The frame A of the saw consistsof the arms B B, cross-piece C, andbar D; the cross-piece being fitted at one end to the arm B, and at the other to the bar D, which is hinged to the arm B near the lower end of the latter. The `bar D and arm B arealso connected by a bolt, a; and to the lower ends of the two arms B and B is secured the saw-blade b.

lo the arm B is connected one end of a rack, c, theoppositc end of which projects through an opening in the upper end of the bar'iD, and across this opening extends a pin,t; the toothed edge of the rack e being maintained in contact with the pin by u spring, e, which is secured to the bar D by the bolt a, as shown in the drawing.

When the saw-blade becomes slack the tension is increased by bringing the upper end of the bar B' closer to the bar D, the arm being held in its position by the rack which slides forward andr catches into the pin t.

When the saw is to be slackened the rack e is elevated from contact with the pin t, so that the arm B muy be moved outward.

The devices above described are similar to those in saws heretofore used, and although very etlicient for imparting the desired tension to the saw-blade, they are objectionable sofar as regards the exposure of the rack e, which, on being raised to release the arm B', moves suddenly through the opening in the bar D, and is apt to cut or otherwise injure the hand of the operator.

In order to prevent such accidents, I secure to the-bar D a guard, F, which consists of a {lat tube open at one end to receive the rack e, and hung to the pin t so as to be capable ofthe slight vertical movement required to' raise and depress the end of the rack, this guardeiectually preventing the hand of the operator lfrom coming in contact with or being injured by the rack, without interfering with the free movements of the latter.

Without confining myself` to a guard of' the precise form herein described and shown, I claim as my invention, and desire to secure by Letters Patent- The guard F, enclosing a portion ofthe rack e, and connected to the bar D ofthe saw-frame, all substantially as4 described for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' HENRY Diss'roN.

VVitneSseS:

CHARLES E. Fosrnnl WM. HALL WAXLER. 

